Stone-splitting tool.



v T. LARNEY.

SI ONE SPLITTING TOOL.

APPLICATION 'FILED AUG.23. 19H- Patented May'14,1918.

UNITED %TATE% PATENT QFFIGE,

THOMAS LARNEY, OF VANCOUVER, BRITISH COLUMBIA, CANADA.

STONE-SPLITTING TOOL.

Application filed August 23, 1917.

'1 b all whom it may concern:

Be it known that I, THOMAS Lsnnnr, a citizen of the Dominion of Canada,residing at Vancouver, British Columbia, Dominion of Canada, haveinvented certain new and useful Improvements in Stone- Splitting Tools;and I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

This invention relates to improvements in stone splitting tools.

One object of the present invent-ion is to provide a novel andeiiicien-t device whereby the stone can be efiectively and evenly splitwithout destroying the uniformity of the splitting line at the outerends of the holes bored therein.

Another object is to provide a feather for use in connection with thesplitting Wedge of such construction that the splitting strain will bebrought to hear at a distance down inside of the hole rather than at themouth of the hole as is the usual result with devices of this characterheretofore.

Other objects and advantages will be apparent from the followingdescription when taken in connection with the accompanyii'ig drawing.

In the drawing:

Figure l is an elevation of one of the feathers and the splitting wedgein position Within an opening in a stone, the stone being shown insection.

Fig. 2 is a vertical sectional view taken on the line 2-2 of Fig. 1. thewedge being shown in elevation.

Fig. 3 is a perspective view of one of the feathers removed from thestone.

Referring particularly to the accompany ing drawing there is shown aportion of a stone 1 3 in which is formed an opening or recess 12, whichis one of a number arranged in a row in the manner usually adopted insplitting stone.

Disposed in the opening are the feathers 10 each of which is formed witha semi- Copies of this patent may be obtained for Specification ofLetters Patent.

Patented May 14, 1918. Serial No. 187,839.

cylindrical exterior contour, and has a channel or groove formedlongitudinally throughout the entire length of the fiat face thereof.This channel or bore tapers from a point 16, toward both ends of thefeather, the longer portion being represented by the character A whilethe shorter portion is represented by the character B. The point 16 is,in effect, a shoulder, and as these shoulders are disposed in the sameplane, when the two feathers are disposed in the recess 12, they form acircular shoulder or rib.

A tapering pin 19 is adapted to be inserted between the feathers and inthe larger end of the longer bore thereof. The outer or upper end of thewedge is then struck with a hammer, or other suitable impact tool,whereby the smaller end of the pin is driven downwardly between theshoulders 16, with the result that the stone will be split at a pointinwardly of the recess and on a straight line on which the roW ofrecesses are formed. This will obviate the usual undesirable jaggededges around the mouths of the recesses.

In the feathers now in use, the bore therethrough is tapered constantlyfrom one end to the other, whereby when the wedge pin is driven into thebore between the feathers, the spreading action takes place at the mouthof the recess, with the result that the mouth of the recess is jagged.

l/Vhat is claimed is:

In a stone splitting device, the combination with a tapering wedgemember, of a pair of semicylindrical feathers each having a longitudinalchannel formed in the flattened face thereof, said channel Wideningtoward both ends of the feather from an intermediate point near one endof the feather.

In testimony whereof, I atfix my signature in the presence of twoWitnesses.

THOMAS LARNEY. Witnesses:

F. J. BAYFIELD, MADELEINE TATTERSALL.

Washington, D. C.

